C93
Globular Cluster in Pavo
About
A globular cluster in Pavo, about 13,000 light-years away, ranked the fourth-brightest in the sky. Its tightly packed core suggests it has gone through core collapse, and it holds blue stragglers and six X-ray sources.
Imaging tips
- Needs 1510–2520 mm on APS-C (2320–3870 mm full frame) to span a third to half of the frame; it is bright at magnitude 5.4, with surface brightness 20 mag/arcsec².
- A published RGB frame used 18 × 300 s (1.5 hours) on a 106 mm f/5 refractor.
- The cluster's centre is dense, only about 1.3 light-years across, so fine pixel scale and sharp stars matter most there.
- Never rises from 50°N or 35°N (peaks near −20° and −5°). From the south it is highest around midnight in early July.
Facts
- Size
- 16′
- Magnitude
- 5.4
- Coordinates
- RA 19h 10.9m, Dec −59° 59′
- Framing, APS-C
- 1510–2520 mm
- Framing, full frame
- 2320–3870 mm
- Best months
- Jun, Jul
- Peak altitude
- never rises from 50°N, never rises from 35°N